AnyStop is also easy to use but requires a network connection for its better features. In one, it relies on a device’s GPS function to deduce the user’s location and compare that with train and bus locations to calculate the arrival time to the station closest to the user.

Such arrival predictions are available for almost half of AnyStop’s cities, including the Muni lines of San Francisco and mass transit in Boulder, Colo.

Brendan Nee, one of AnyStop’s developers, said the app was best suited to those who already knew their routes, and wanted to optimize the timing of their journeys. In that respect, longer-term visitors and commuters will find it more useful than tourists.